Purpose: The aim of this study was to assess the associationbetween the presence of maxillary incisor trauma (MIT)with age, gender, dentition type, the degree of overjet (OJ),lip form, respiratory type and dental arch form in patientswith Class II division 1 dental malocclusion.Subjects and Methods: 256 patients (mean age: 15.80± 2.2) were included in this study. The patients' gender,dentition type, superior lip form, dental arch form andrespiratory type were recorded. Participants were dividedinto four groups according to the severity of OJ: 3.5 mm<Group 1 (OJ I) <=6 mm with competent lip, 3.5 mm<Group2 (OJ II) <= 6 mm with incompetent lip, 6 mm<Group 3 (OJIII) <=9mm, 9 mm<Group 4 (OJ IV). Mann Whitney-U testwas used to examine the group differences for trauma andnon-trauma groups. Logistic regression analysis was usedto assess the factors for trauma and their risk indicators.Results: 3.5 mm< OJ II<= 6 mm with incompetent lip had thehighest odds of experiencing MIT among the OJ groups withan odds ratio (OR) of 3.143 and 95% confidence interval(CI) 1.125-2.779. The odds were 3.572 times higher inthe group with short lip form than found in the group withnormal lip form (OR 3.572, 95% CI 1.130-2.340).Conclusion: The age, gender, respiratory type and dentalarch form were not significantly associated the risk of MIT.OJ between 3.5 mm and 6 mm (with incompetent lip) andshort lips increased the risk of having maxillary incisortrauma in patients with Class II division 1 malocclusion.